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Sigma-Aldrich

Fluorescein 5(6)-isothiocyanate

BioReagent, suitable for fluorescence, mixture of 2 components, ≥90% (HPLC)

Synonym(s):

FITC, Fluorescein isothiocyanate

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About This Item

Empirical Formula (Hill Notation):
C21H11NO5S
CAS Number:
27072-45-3
Molecular Weight:
389.38
Beilstein:
1407295
EC Number:
248-207-7
MDL number:
MFCD00005063
UNSPSC Code:
12171500
PubChem Substance ID:
329757273
NACRES:
NA.32

Quality Level

100

product line

BioReagent

Assay

≥90% (HPLC)

fluorescence

λex 492 nm; λem 518 nm in 0.1 M phosphate pH 8.0

suitability

suitable for fluorescence

storage temp.

−20°C

SMILES string

Oc1ccc2c(Oc3cc(O)ccc3C24OC(=O)c5cc(ccc45)N=C=S)c1

InChI

1S/C21H11NO5S/c23-12-2-5-16-18(8-12)26-19-9-13(24)3-6-17(19)21(16)15-4-1-11(22-10-28)7-14(15)20(25)27-21/h1-9,23-24H

InChI key

MHMNJMPURVTYEJ-UHFFFAOYSA-N

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General description

Fluorescein 5(6)-isothiocyanate, also known as FITC, is a weakly acidic hydroxyxanthene whose overall size is small, with both carboxylic acid and isothiocyanate substituents on the pendant phenyl ring. The dye has a moderately sized, nonplanar aromatic system. The isothiocyanate group reacts with nucleophilic substituents (e.g. amino, hydroxyl, thiol) of biomolecules to be attached as a fluorescent label. The maximum emission of the dye is at 519nm in the same solvent.

Application

Fluorescein 5(6)-isothiocyanate (FITC) labelled molecules are used in non-microscopic immunoassays and physiological tracing experiments. FITC is widely used in flow cytometry experiments for staining proteins, nuclei, and subnuclear particles. White blood cells (WBCs) are marked with FITC to study their response toward a chemoattractant, eventually being measured.
For fluorescent labeling of proteins (e.g. immunofluorescence); H Protein labeling for gel chromatography

Packaging

Bottomless glass bottle. Contents are inside inserted fused cone.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

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